CN204008862U - A kind of single duplex potentiometer multifunctional testing circuit - Google Patents
A kind of single duplex potentiometer multifunctional testing circuit Download PDFInfo
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- CN204008862U CN204008862U CN201420563866.9U CN201420563866U CN204008862U CN 204008862 U CN204008862 U CN 204008862U CN 201420563866 U CN201420563866 U CN 201420563866U CN 204008862 U CN204008862 U CN 204008862U
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- potentiometer
- circuit
- amplifier
- ina128
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Abstract
The utility model relates to a kind of single duplex potentiometer multifunctional testing circuit, comprise A connection circuit and the B connection circuit identical with A connection circuit structure, A connection circuit comprises INA128 amplifier one, two and operational amplifier OP2227, range shift switch S1～S5, six analog switch S6～S11, constant current source, noise measuring circuit and duplex synchronizing characteristics metering circuit; Anti-phase, each ground connection of in-phase input end of amplifier one, connect reference voltage, output terminal is connected with S1～S5 one end, and S1～S5 other end connects respectively one end of in-phase input end and S6, the S7 of OP2227; The inverting input of OP2227 connects its output terminal, and its output terminal connects the output reference end of amplifier one; S6, the S7 other end respectively connect the second, first pin of potentiometer.The utility model can be measured total resistance, front and back zeropoint resistance, moving noise, Static Contact resistance, synchronizing characteristics simultaneously, and Optimization Technology, enhances productivity.
Description
Technical field
The utility model relates to electronic measuring technology field, more particularly, relates to a kind of high speed, single duplex potentiometer multifunctional testing circuit.
Background technology
Potentiometer is played the part of very important role in productive life: simply connected potentiometer is having a very wide range of applications aspect control, adjusting and man-machine interaction; Duplex potentiometer is the important electronic component of realizing duplex adjusted in concert and control.Before dispatching from the factory, each potentiometer must measure tens kinds of parameters.Therefore, measure fast and efficiently these parameters and can enhance productivity greatly, and guarantee the quality of product.
Popularity based on potentiometer application, its turnout is very large.It is reported, at Along The East Coast of Zhejiang And Jiangsu Provinces one band, have very many potentiometer manufacturing enterprises, and the parameter that potentiometer technology need detect is a lot, has all-in resistance, front zeropoint resistance, rear zeropoint resistance, Static Contact resistance, dynamic contact resistance, moving noise, synchronizing characteristics.These parameters of each potentiometer could be qualified after must measuring before dispatching from the factory, screening.Traditional instrument generally can only be measured single parameter, and for example always hindering instrument can only be for the total resistance value of test potential device, and acoustic meter can only be for the sliding noise of test potential device.The detection of a potentiometer will be through ten multiple working procedures, and very loaded down with trivial details, work efficiency is low, waste a large amount of human and material resources.
Summary of the invention
For overcoming above-mentioned defect, the utility model provides a kind of single duplex potentiometer multifunctional testing circuit, this test circuit can be measured total resistance, front zeropoint resistance, rear zeropoint resistance simultaneously, moving noise, Static Contact resistance, these six parameters of synchronizing characteristics, have optimized potentiometer production test technique greatly, greatly reduce testing cost, improved production efficiency.
For achieving the above object, the technical solution of the utility model is:
A single duplex potentiometer multifunctional testing circuit, comprises A connection circuit and B connection circuit; Described A connection circuit comprises INA128 amplifier one, INA128 amplifier two, operational amplifier OP2227, range shift switch S1 ~ S5, six analog switch S6 ~ S11, constant current source, noise measuring circuit and duplex synchronizing characteristics metering circuit;
The reverse inter-input-ing ending grounding of described INA128 amplifier one, in-phase input end connects reference voltage, and its output terminal is electrically connected to one end of range shift switch S1 ~ S5; And the other end of range shift switch S1 ~ S5 is electrically connected with the in-phase input end of operational amplifier OP2227, one end of analog switch S6, S7 respectively; The inverting input of described operational amplifier OP2227 is connected with its output terminal, and its output terminal is connected with the output reference end of INA128 amplifier one simultaneously;
The sliding end that the other end of described analog switch S6 connects potentiometer is the second pin, and the other end of described analog switch S7 is connected with the first pin of potentiometer;
The sliding end of described potentiometer connects constant current source by analog switch S8; The first pin of potentiometer connects a power supply by analog switch S11, the three-prong ground connection of potentiometer;
The in-phase input end of described INA128 amplifier two is connected with the sliding end of potentiometer, its inverting input is connected with the three-prong of potentiometer, by S10, is connected with the first pin of potentiometer by S9 respectively, and the output terminal of INA128 amplifier two is connected with duplex synchronizing characteristics metering circuit input end;
The input end of described noise measuring circuit forms and is electrically connected to the sliding end of potentiometer;
Described B connection circuit is identical with the circuit structure of A connection circuit;
Described range shift switch S1 ~ S5 comprises 5 switches parallel with one another, and on each switching circuit, is in series with respectively resistance.
Design feature of the present utility model is:
1, the utility model adopts voltage method and constant flow method to judge and measures potentiometer front and back zero-bit, has simplified circuit structure;
2, the utility model is by the optimal design of circuit structure, it can measure total resistance in potentiometer knob rotates one-period, front zeropoint resistance, rear zeropoint resistance, moving noise, Static Contact resistance, these six parameters of synchronizing characteristics, can rotate a semiperiod build-in test Contact Resistance at potentiometer.The utility model can directly replace the multiple single or comprehensive tester in potentiometer production run, has greatly optimized potentiometer production test technique, greatly reduces testing cost, enhances productivity.
3, the utility model circuit structure is simple, practical, can under minimum analog switch quantity, realize the measurement of seven kinds of parameters.
Accompanying drawing explanation
Fig. 1 is A connection circuit structure schematic diagram of the present utility model.
Fig. 2 is B connection circuit structure schematic diagram of the present utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Embodiment: the utility model relates to a kind of single duplex potentiometer multifunctional testing circuit, comprises that A connection circuit and the B of same circuits structure joins circuit; Described A connection circuit is for the first translocation amount of simply connected potentiometer or duplex potentiometer; B connection circuit is for duplex potentiometer the second translocation amount, and when measuring for simply connected potentiometer, its pin is unsettled.
As shown in Figure 1: A connection circuit comprises INA128 amplifier one, INA128 amplifier two, operational amplifier OP2227, range shift switch S1 ~ S5, six analog switch S6 ~ S11, constant current source, noise measuring circuit and duplex synchronizing characteristics metering circuit;
The reverse inter-input-ing ending grounding of INA128 amplifier one, in-phase input end connects reference voltage, its magnitude of voltage for setting, the output terminal of INA128 amplifier is electrically connected to one end of range shift switch S1 ~ S5; And the other end of range shift switch S1 ~ S5 is electrically connected with the in-phase input end of operational amplifier OP2227, one end of analog switch S6, S7 respectively; The inverting input of described operational amplifier OP2227 is connected with its output terminal, and its output terminal is connected with the output reference end of INA128 amplifier one simultaneously; Wherein range shift switch S1 ~ S5 comprises that 5 switches are parallel with one another, on its each switching circuit, is in series with respectively resistance;
The sliding end that the other end of analog switch S6 connects potentiometer is the second pin, and the other end of described analog switch S7 is connected with the first pin of potentiometer; The sliding end of described potentiometer connects the constant current source of 5mA by analog switch S8; The first pin of potentiometer connects a 10V power supply, the three-prong ground connection of potentiometer by analog switch S11;
The in-phase input end of INA128 amplifier two is connected with the sliding end of potentiometer, its inverting input is connected with the three-prong of potentiometer, by S10, is connected with the first pin of potentiometer by S9 respectively, and the output terminal of INA128 amplifier two is connected with duplex synchronizing characteristics metering circuit input end;
In the present embodiment, the input end of noise measuring circuit and the sliding end of potentiometer form and are electrically connected to.
As shown in Figure 2: B connection circuit comprises amplifier INA128 tri-and amplifier INA128 tetra-, low noise amplifier OP2227 bis-, range shift switch S12 ~ S16, six extremely low internal resistance SPST analog switch S12-S22, constant current source, noise measuring circuit and duplex synchronizing characteristics metering circuit; Its circuit structure is identical with A connection circuit.
In the present embodiment, resistance R 1 ~ R10 is constant current resistance.
Principle of work of the present utility model, and the process of seven parameters of disposable measurement list/duplex potentiometer is as follows, the A of take connection circuit is example:
1. always resistance
Cut off S6, S8, S10, S11, connects S7, S9; S1 ~ S5 is range shift switch, according to the closed different switch of different potentiometer resistances, enables the precision constant current source consisting of amplifier INA128 mono-and operational amplifier op2227 and selects corresponding electric current I size (I=reference voltage/constant current resistance).Now electric current I is applied to one and three-prong of each connection of potentiometer, and the output terminal V of operational amplifier op2227 is ohmically pressure drop.According to Ohm law, be easy to just can calculate total resistance resistance.Use high-precision adc to gather the measurement that voltage V not only can realize the total resistance of each connection, but also can judge whether potentiometer is inserted into measurement socket.
2. Static Contact resistance
As shown in the figure: potentiometer center tap reference position is placed on to total kilometres 40% ~ 60% place, disconnects S7, connect S6.Now electric current I is by the center tap inflow of potentiometer and by three-prong ground connection.Disconnect S9, connect S10, now amplifier INA128 bis-is output as the voltage difference (static resistance pressure drop) between the every di-pin of potentiometer and a pin.After AD conversion, be easy to just can obtain Static Contact resistance value.
3. front zero-bit
After total resistance and Static Contact resistance measurement, disconnect S10, connect S11, S9, is applied to potentiometer one pin and three-prong two ends by 10V voltage.Connect S9, disconnect S10, when potentiometer rotating shaft is rotated when approaching tripod, amplifier INA128 bis-output voltages can be similar to close to zero.By high-precision A/D, detect and confirm potentiometer center tap when the front zero-bit position (zero-bit before voltage method judgement), cut off S11 and connect S8,5mA electric current is inputted from center tap.Residual resisitance pressure drop will be from amplifier INA128 bis-outputs.
4. moving noise
When potentiometer center tap, in the past zero-bit is when zero-bit moves backward, and S11 is closed, and noise is exported from center tap, by noise measuring circuit, amplifies, and after the signal conditions such as rectification, by AD, is gathered, and records maximal value.
5. synchronous
When in the past zero-bit when zero-bit moves of potentiometer center tap backward, S21 is closed, utilize high-precision A/D in duplex synchronizing characteristics metering circuit to gather two magnitudes of voltage, take and first as benchmark connection, take the logarithm then to subtract each other and get final product to obtain synchronization factor (circular refers to GB/T 15298-94).
6. rear zero-bit
After synchronization parameter is measured, connect S11, S10, S9, now equivalent potential device three-prong ground connection, and then connection S8, makes 5mA electric current input from center tap, from three-prong output ground connection.Residual resisitance pressure drop will be from amplifier INA128 bis-outputs.After adopting high-precision A/D collection, just can calculate rear zero-bit.
7. dynamic contact resistance
When after cut off S6 after zero testing, S8, S10, S11, connects S6 and corresponding range shift switch; Now electric current I is by the center tap inflow of potentiometer and by three-prong ground connection.Now amplifier INA128 bis-is output as the voltage difference between the every di-pin of potentiometer and a pin.Controller can rotate potentiometer on one side to front zero-bit with high-precision A/D collection on one side.The maximal value that AD collects is dynamic contact resistance.
The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure transformation that utilizes the utility model instructions and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (1)
1. a single duplex potentiometer multifunctional testing circuit, is characterized in that: comprise A connection circuit and B connection circuit; Described A connection circuit comprises INA128 amplifier one, INA128 amplifier two, operational amplifier OP2227, range shift switch S1 ~ S5, six analog switch S6 ~ S11, constant current source, noise measuring circuit and duplex synchronizing characteristics metering circuit; The reverse inter-input-ing ending grounding of described INA128 amplifier one, in-phase input end connects reference voltage, and its output terminal is electrically connected to one end of range shift switch S1 ~ S5; And the other end of range shift switch S1 ~ S5 is electrically connected with the in-phase input end of operational amplifier OP2227, one end of analog switch S6, S7 respectively; The inverting input of described operational amplifier OP2227 is connected with its output terminal, and its output terminal is connected with the output reference end of INA128 amplifier one simultaneously; The sliding end that the other end of described analog switch S6 connects potentiometer is the second pin, and the other end of described analog switch S7 is connected with the first pin of potentiometer; The sliding end of described potentiometer connects constant current source by analog switch S8; The first pin of potentiometer connects a power supply by analog switch S11, the three-prong ground connection of potentiometer; The in-phase input end of described INA128 amplifier two is connected with the sliding end of potentiometer, its inverting input is connected with the three-prong of potentiometer, by S10, is connected with the first pin of potentiometer by S9 respectively, and the output terminal of INA128 amplifier two is connected with duplex synchronizing characteristics metering circuit input end; The input end of described noise measuring circuit forms and is electrically connected to the sliding end of potentiometer; Described B connection circuit is identical with the circuit structure of A connection circuit; Described range shift switch S1 ~ S5 comprises 5 switches parallel with one another, and on each switching circuit, is in series with respectively resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420563866.9U CN204008862U (en) | 2014-09-28 | 2014-09-28 | A kind of single duplex potentiometer multifunctional testing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420563866.9U CN204008862U (en) | 2014-09-28 | 2014-09-28 | A kind of single duplex potentiometer multifunctional testing circuit |
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| CN204008862U true CN204008862U (en) | 2014-12-10 |
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| CN201420563866.9U Withdrawn - After Issue CN204008862U (en) | 2014-09-28 | 2014-09-28 | A kind of single duplex potentiometer multifunctional testing circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237644A (en) * | 2014-09-28 | 2014-12-24 | 潘柯文 | Multidirectional test circuit for simplex-duplex potentiometers |
-
2014
- 2014-09-28 CN CN201420563866.9U patent/CN204008862U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237644A (en) * | 2014-09-28 | 2014-12-24 | 潘柯文 | Multidirectional test circuit for simplex-duplex potentiometers |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141210 Effective date of abandoning: 20171114 |